Some older Microsoft libraries did not have uint64_t, so use boost/cstdint.hpp for it.

test/endian_operations_test.cpp

@@ -34,6 +34,7 @@
 #include <boost/type_traits/is_signed.hpp>
 #include <boost/core/lightweight_test.hpp>
 #include <boost/detail/lightweight_main.hpp>
+#include <boost/cstdint.hpp>
 #include <cassert>
 #include <iostream>
 #include <sstream>
@@ -336,7 +337,7 @@ void test_inserter_and_extractor()
   be::big_uint64_t bu64(0x010203040506070ULL);
   be::little_uint64_t lu64(0x010203040506070ULL);
 
-  uint64_t x;
+  boost::uint64_t x;
 
   std::stringstream ss;